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Awesome, I've been using the wESP (https://wesp32.com/) for most things but I like the size (and price point) of these.

Granted, they fit different use cases as the wESP has more I/O exposed but is quite a bit larger.

These little boards are great - I'd recommend the isolated version for anything that might be referenced back to ground potential.

We have one in an OpenEVSE, it's been ticking along no problems for a couple years now. In that scenario, in theory the PoE allows the ESP32 to detect if the EVSE breaker pops - I've not had that happen, but it seemed like a worthwhile feature to consider ;).

That looks great. The 0-70C operating range is noteworthy if you want to use it for a doorbell, though.

If you're worried about sub-zero temperatures, couldn't you just have it busy-loop or even drive a small heater to generate heat? Just enough to keep the doorbell enclosure warm.

If it's running off PoE it's not like you have to worry about battery budget or efficiency so much.

Not sure if there are insulating materials available that provide good thermal insulation but not acoustic insulation?